Katherine Ann Maher, M.D.

Primary specialty

Rheumatology PhysicianTaxonomy code 207RR0500X

License

D0088133 Issued in MD

Practice address

161 Thomas Johnson Dr Ste 250
Frederick, MD 21702-4958

Phone

(301) 942-7600

Fax

(301) 694-0187

NPI assigned

Apr 6, 2010

Last updated

Feb 17, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in DC, MD2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Rheumatology

Education

Georgetown University School of Medicine, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Arthritis and Rheumatism Associates PCGroup PAC ID 5597750703, 50 clinicians

Amber Hill Physical Therapy IncGroup PAC ID 8527963917, 336 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Frederick Health Hospital Hospital, Frederick, MD, CCN 210005

Merit-based Incentive Payment System (MIPS)

Final score

85.72 of 100Reported as group

Quality

93.41

Promoting interoperability

100

Improvement activities

40

Cost

59

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/
• Direct secure messaging: katherine.mahermd.p1@direct.aramd.nextgenshare.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Arthritis and Rheumatism Associates PC

  • Rheumatology Physician
  • Rockville, MD
  • NPI 1447259866

  DC

  Medicare reassignment Care Compare group NPD
• Amber Hill Physical Therapy, Inc.

  • Physical Therapist
  • Frederick, MD
  • NPI 1548290224
  Care Compare group
• Frederick Health Hospital Inc

  dba Frederick Health Hospital

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Frederick Health Hospital Inc

  dba Frederick Health Hospital

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1270512000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771286400000",
    "number": "1225353865",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7361 CALHOUN PL STE 600",
            "city": "ROCKVILLE",
            "state": "MD",
            "postal_code": "208552788",
            "telephone_number": "301-942-7600",
            "fax_number": "301-942-3521"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "161 THOMAS JOHNSON DR STE 250",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217024958",
            "telephone_number": "301-942-7600",
            "fax_number": "301-694-0187"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "14995 Shady Grove Rd Ste 250",
            "address_purpose": "LOCATION",
            "city": "Rockville",
            "state": "MD",
            "postal_code": "208508727",
            "country_code": "US",
            "telephone_number": "301-942-7600",
            "fax_number": "301-217-9241",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAHER",
        "first_name": "KATHERINE",
        "middle_name": "ANN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2010-04-06",
        "last_updated": "2026-02-17",
        "certification_date": "2026-02-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RR0500X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Rheumatology",
            "state": "MD",
            "license": "D0088133",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Magnolia Behavior Health Center LLC
• Magnolia Behavior Health Center LLC
• Magnolia Behavior Health Center LLC
• Magnolia Psychiatric Services PLLC
• Philip Jay Magpantay, DDS
• Omar K Mahmassani, D.D.S.
• Syed Kashif Mahmood, M.D.
• Chrissy Mahoney
• Betty Mai, PHARMD
• Main Place Addiction Treatment Center LLC.

• Rheumatology Physician in Frederick, MD
• Providers in Frederick, MD by specialty
• Rheumatology Physician in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 17, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.